A Decomposition Theorem for Positive Maps, and the Projection Onto a Spin Factor
AbstractIt is shown that each positive map between matrix algebras is the sum of a maximal decomposable map and an atomic map which is both optimal and co-optimal. The result is studied in detail for the projection onto a spin factor.
How to Cite
Størmer, E. (2016). A Decomposition Theorem for Positive Maps, and the Projection Onto a Spin Factor. MATHEMATICA SCANDINAVICA, 118(1), 106-118. https://doi.org/10.7146/math.scand.a-23300